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From aaron morton <>
Subject Re: Active / Active Data Center and RF
Date Sun, 20 Mar 2011 22:56:27 GMT
The API provides for Quourm CL to be used either across all replicas (ignoring DC's), the local
DC or each DC. See Consistency level here

Hope that helps

On 19 Mar 2011, at 06:54, mcasandra wrote:

> When in active/active data center how to decide right replication factor?
> Client may connect and request for the information from either data center
> so if locally it's RF=3 then in multiple data center should it be RF=6 in
> active/active?
> Or what happens if it's RF=3 with network toplogy and 2 copies are stored in
> Site A and 1 copy in Site B data center. Now client for some reason is
> directed to Site B data center and does a write, now would Site B have 2
> copies and Site A one (or still 2)? It's getting confusing slowly :) I have
> several more questions but will start with understanding this first. 
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